A numerical experiment is made to study the combined effect of differential cooling and bottom topography on the formation of Ulleung Warm Eddy. The Ulleung Warm Eddy appears after the passage around the Ulleung Basin of coastal trapped baroclinic waves generated in the north initial density front to the north, the continental slopes both to the west and south, and the Yamato Rise to the east. It resides therefore always inside the Ulleung Basin, as confirmed by observations.

To establish an appropriate measure for the prevention of food poisoning from raw fish flesh (sashimi), distribution and population density of Vibrio vulnificus were investigated as environmental factors were changed. The bacteria were detected only in August during the study period from February to November, 1989. The number of bacteria was . In August, salinity and pH were low, but water temperature and COD were high as compared to the rest of months.

Changes in electric resistance was measured to carry out the kinetic analysis of milk gellation upon addition of rennet. Using pasteurized milk and commercial rennin, kinetic properties were investigated during milk gellation in terms of initial hydrolysis and coagulation steps. Specially designed reactor with two platinum electrodes was used throughout the experiments. As a function of either milk concentrations or reaction temperatures, gel time exhibited directly proportional relations: on the contrary, gel time was inversely pro-portional to enzyme concentration. Activation energies for enzymatic degradation and cogulation were 16.3, 4.6 and 34, 8.6 Kcal/mol, repectively. This simple analytical method proved to be very effective to characterize the mechanism of milk gellation. Moreover, unlike other methods, this method reguired simple apparatus and short time of analysis.

Surface phytoplankton biomass was measured at approxinately one month intervals from July 1986 to August 1987. There was a peak phytoplankton biomass in the very low salinity region during summer and autumn when river discharge was low. The peak biomass occurred independent of the tidal state, location of nutrient input, nutrient concentration and temperature. The peak biomass are probably caused by the hydrodynamic trapping, density-seletive retention of particles by esturarine circulation.

Phytoplankton dominant species and the relationship between nutrient concentrations and salinity in the Yeosu Haeman were investigated in April, June and August, 1989. The dominant species in the Yeosu Haeman were similar with those reported previously in the inner Kwangyang Bay except a diatom, Navicula sp. in April. The species seems to be advected to the surface from the bottom during the dredging operation. Nitrate concentrations were negatively correlated with salinity during the study period, while silicate and phosphate concentrations had no relationships with salinity except in April. It seems that biological uptake of nitrate was not significant, but concentrations of silicate and phosphate were affected by the phytoplankton uptake in the Yeosu Haeman.

In a laboratory model the response of the boundary layer flow over topography is studied in a rotating sliced cylinder by employing the source-sink analogy with Ekman layer dynamics. The boundary layer flow is produced by two different fluid. In the first experiment homogeneous fluid is used both for the source and the working fluid of the container. In the second experiment a denser fluid is used for the source with the same working fluid. For the homogeneous western boundary layer flow both the northward and the southward flow were affected by the topography(ridge) to produce a cyclonic motion near the ridge. When woughward moving heavy boundary flow of slower speed and the northward moving faster flow were present at the same time, the splitting of southward flow and the separating of the northward flow were observed with a cyclonic motion at the ridge. The most important factor that influence production of the cyclonic motion has been turned out to be the presence of the topography in the western boundary layer. In particular the role of the southward moving heavy flow over the interior flow pattern was found to be very significant.

Mulletts, Mugil cephalus were exposed to artificial sea water containing di-2-ethylhexyl phthalate(DEHP) during 15 days and returned to the DEHP free sea water in order to know bioconcentration and depuration of DEHP in the fish. Bioaccumulative process of DEHP in the fish was rather fast, and bioconcentration level of and a bioconcentration factor of were reached after one any of exposure. The biological half-life of DEHP in fish was 1.8 days. Five intermediate metabolites of DEHP were detected in the benzene and ethyl acetate fraction of fish by TLC.